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digitalmars.D - Calling C functions from D that return structs

I want a workabout for this bug:
http://d.puremagic.com/issues/show_bug.cgi?id=3717
Basically, a C function that returns a structure and is compiled with a non-DMC
compiler thrashes the stack when called from D. Here's the assembly code for a
function that does it (sorry for the AT&T assembler syntax):
<_al_map_rgba>:
push %ebp
mov %esp,%ebp
mov 0x8(%ebp),%eax
movzbl 0xc(%ebp),%edx
mov 0x66d24020(,%edx,4),%edx
mov %edx,(%eax)
movzbl 0x10(%ebp),%edx
mov 0x66d24020(,%edx,4),%edx
mov %edx,0x4(%eax)
movzbl 0x14(%ebp),%edx
mov 0x66d24020(,%edx,4),%edx
mov %edx,0x8(%eax)
movzbl 0x18(%ebp),%edx
mov 0x66d24020(,%edx,4),%edx
mov %edx,0xc(%eax)
leave
ret $0x4
lea 0x0(%esi),%esi
It's signature is this:
ALLEGRO_COLOR al_map_rgba(ubyte r, ubyte g, ubyte b, ubyte a);
Where ALLEGRO_COLOR is a quad of bytes. What I want is some sort of inline
assembly preamble (and/or postamble, as it were) that will make it possible for
me to call that function correctly. The suggestion made by Walter in the bug
report is unacceptable for my purposes.
What I have tried is this:
ALLEGRO_COLOR get()
{
auto c = al_map_rgba(255,255,255,255);
asm
{
sub ESP, 4;
}
return c;
}
But it did not work. Any help appreciated.
-SiegeLord